Milliwatt second harmonic generation in quantum cascade lasers with modal phase matching
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abstract
Milliwatt second harmonic power at 4.45 m was achieved in InP lattice-matched quantum cascade lasers with monolithically-integrated resonant nonlinear cascades and modal phase matching. The use of an InP top-cladding layer and high-reflectance coating on the laser back facet enabled high linear laser power and consequently record nonlinear power.